cpu hotplug test scenarii

Daniel Lezcano daniel.lezcano at linaro.org
Wed Sep 28 12:19:41 UTC 2011


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On 09/28/2011 01:04 PM, Amit Kucheria wrote:
> On Wed, Sep 28, 2011 at 1:18 PM, Daniel Lezcano
> <daniel.lezcano at linaro.org> wrote:

[ ... ]

>> Test 3: check the affinity does not work on an online cpu
> 
> ^^^^ offline

right. Thanks.

[ ... ]

>> Test 6: do some stress test
>> ===========================
>>
>> for each cpu
>>  * for i in 1 .. 50
>>   * set cpuX offline
>>   * set cpuX back online
> 
> How about something that measures the latency of a hotplug under 2-3
> different workloads. Vincent has scripts that might help with that.
> 
> The higher the workload, the higher the hotplug latency due to task migration.

Yes, definitely we should add some tests for measurements, not only for
cpu hotplug but also for the other pm blocks. But I would like to
postpone that as a separate test set focused on perf and measurements.
Lava is waiting for "succeed", "fail", "skip" results, so adding
numerical results will make the test suite to fail.

I hope we can discuss at UDS-P about adding some perf tests and
integrate them in lava.


> It would also be interesting to know what happens when processes
> pinned to a cpu have the cpu offlined underneath them.

Right, I think it is the test David proposed.


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